Mouthpiece for telephone-transmitters.



APPLICATION FILED JUHE 8, 1909.

Patented Dec. 14, 1909.

2 8KEETSSHEIIT 1.

lIVVE/VTOR ATTORNEY.

J. A. JAMIESON.

MOUTHPIEGB FOB TELEPHONE TBANSMITTERS.

APPLIOATIOH mum mm: a, 1909.

943,149. Patented Dec. 14, 1909.

2 SHEETS-SHEET 2.

WITNESSES mum/e By a 5M Y7 w I 'Ll/L.

ATTORNEY.

JOHN A. JAMIESON,

F HARRISON, NEW JERSEY.

MOUTHPIECE FOR TELEPHONE-TRANSMITTERS.

Specification of Letters Patent.

Patented Dec. 14., 1909.

Application filed June 8, 1909. Serial No. 500,910.

To all whom it may concern:

Be it known that I, JOHN A. JAMIESON, a subject of Great Britain, residing at Harrison, in the count of Hudson and State of New Jersey, have mvented certain Improvements in Mouthpieces for Telephone-Transmitters, of which the following is a specification.

The objects of this invention are to pro vide a mouthpiece for telephone transmitters which shall be perfectl sanitary; to provide a mouthpiece which shall afford minimum opportunity for the lodgment of dirt and other foreign substance; to secure a passage for the sound waves which is open at both ends; to thus avoid the muflled effect due to talking into a closed pocket; to obtain a mouthpiece which can be adjusted to different positions; to thus provide a convenient, effective and sanitary mouthpiece, and to obtain other advantages and results as may be brought out in the following de scription.

Referring to the accompanying drawings, in which like numerals of reference indicate corresponding parts in each of the several fig urcs, Figure l is a side elevation of a mouthpiece of my improved construction applied to the transmitter of a telephone; Fig. 2 is a central vertical section of the mouthpiece and a portion of the transmitter; Fig. 3 is a central sectional view of the trumpet member of my improved mouthpiece, with a certain lining therein; Fig. 4 is a side view of the trumpet member of my im roved mouthpiece applied directly to a te ephone trans mitter; Fig. 5 is a detail perspective view of a certain bushing adapted to be screwed into the transmitter to receive the mouthpiece; Fig. 6 is a view of a certain friction clip for the said bushing to hold the mouthpiece more firmly therein; Fig. 7 is a side view of a trumpet member of modified construction, and Fig. 8 is a plan of the same; Fig. 9 is a side view of another modified construction of trumpet member, and Fig. 10 is a plan of the same; Fig. 11 is a side view of a still further modified trumpet member.

In said drawings, 10 indicates the top portion of a supporting standard such as commonly used for desk telephones, and 11 is the usual transmitter hinged to the top of said standard as at 12. Said transmitter 11 is of usual construction, providing at its face 13 an interiorly threaded aperture 14 to receive a mouthpiece. In my improved construction, a bushing 15 is screwed into said aperture 14: by means of a threaded end 16, the said bushing providing a radially enlarged outer tubular portion 17. As shown in Figs. 1 and 2, this outer portion 17 of the bushing receives telescopically and iuteriorly one end of an elbow-shaped connecting lllOlll ber 18, said connection being tubular and having its bend somewhat rounded. Preferably said bend is provided at its outer side with a screw cap or plug 19 which when re moved provides access to the interior. Into the outer end of said elbow-shaped connect ing member 18 is telescopically inserted the lateral tubular stem 20 of the trumpet member 21, a. flange 22 on said stem 20 serving to limit its insertion. The said stem 20 tits nicely in the elbow-shaped member 18, so as to hold itself in any position therein to which it may be turned, and furthernun'e said stem is adapted to fit equally well in the outer end portion 17 of the bushing 15, so that it can be inserted therein, as shown in Fig. 4 and hereinafter more fully described. Preferably the walls of said outer portion 17 of the bushing have opposite openings 23, 23, through which friction pieces 24, 24 project into a groove or 300 in the member in sorted in said bushing, said friction pieces 24, 24, being held together by means of a bowed spring 25. The friction pieces enage the bottom of said groove, and thus the friction clip insures greater tightness of fit of the mouthpiece in the said bushing, as well as holding it against escape. A perf0- rated strainer 26 is adapted to be inserted into the end of the mouthpiece member which lies in the bushing 15, to serve the same purpose as such strainers in ordinary mouthpieces.

The trumpet member 21 of my improved mouthpiece preferably has its body portion flaring toward one end, as shown at 27 in Figs. 1 to 4 inclusive, this flaring end being adapted to receive the sound waves from the lips of the speaker. The other end of the trumpet member is open, and the trumpet member is preferably straight as shown. The stem 20 opens directly into the interior cavity of the trumpet member.

In use, the transmitter being arran ed as shown in Figs. 1 and 2, the speaker ta ks di rectl Y into the large end 27 0f the trumpet mem er and so through the same. Enough of the sound waves pass through the stem 20, and so to the diaphragm of the trans Lit) uiitter, to secure an cti'ective action of said diaphragm. and the sound transmitted is clear and distinct because the speaker is not talking into a closed pocket. He is speaking into one end of the open ended trumJct 21 and the opposite end 28 relieves a portion of the sound waves, while those which pass through the lateral stem 20 to the transmitter ll vibrate its diaphragm naturally. Great cleanliness is also secured since the speakers breath can pass directly through the trumpet member 521 and escape at its end 28.

Under some conditions, an interior tube or lining 29 can be inserted in the trumpet member 21 and serve to close the opening into the lateral stem 20. If made of proper material this tube or lining 29 will not prevent the transmission of sound waves to the diaphragm of the telephone transmitter, nor interfere with the telephoning. It will, however, provide a tube entirely closed except at its opposite ends for the speaker to talk through. and thus attain even greater cleanliness, especially since such tube or lining 39 can be taken out of the trumpet member and readily cleaned. Said tube can also be made antiseptic.

Obviously the precise form or shape of trumpet member shown in Figs. 1 to 4;, inclusive, can be varied considerably without departing from the spirit and scope of my invention. For instance in Figs. 7 and 8 I have shown a trumpet member 31 whose larger receiving end 32 opens laterally of the longitudinal line of the member as at 53. and in Fig. 11 I have shown a trumpet member 34 both ends 35 of which are alike and flaring, so that either one can be talked into. as is more convenient. In Figs. 9 and 10 is shown a trumpet member 36 whose tubular portion 37 does not extend across the stem 3%. but is cut oil' in substantially vertical line with the side of said stem to which it is attached, as at 39. The effect of this construction is that the sound waves are not at all confined in their passage across the mouth of the stem 38. although the flaring tubular portion 37 gives them the right direction. Other forms of trumpet member could also be employed.

It will be noted that in using my improved mouthpiece, as shown in Figs. 1 and 2, adjustment may be made of the position of the trumpet member, in two planes at right angles to each other. That is to say, the elbow member 18 can be rotated in the bushing 15, and also the trumpet member 21 can be rotated upon its stem 20 inserted in the elbow member 18. The said trumpet member 21 can thus be brought into almost any desired position above, below and at either side of the transmitter at any angle.

In Fig. 4 the trumpet member 21 is shown inserted directly into the bushing 15, as may sometimes be desired, and obviously here adjustment can be made only by rotating said trumpet member 21 upon its stem, in addition to the usual tilting of the transmit ter 11 upon the support to which it ishingcd.

Having thus described the invention, what I claim is:

1. A mouthpiece for telephone transmitters, comprising a trumpet member having a substantially straight tubular body portion open at both ends, and means interme diate of said ends for securing said body portion to a transmitter.

2. A mouthpiece for telephone transmitters, comprising a trumpet member having a substantially straight tubular body poi; tion open at both ends and having a lateral opening intermediate of said ends, and means for securing said body portion to a transmitter with said opening leading thereto. 7

3. A mouthpiece for telephone transmitters, comprising a trumpet member having a straight tapering tubular body portion with open opposite ends, and a tubular connection projecting laterally from said body portion intermediate of said ends.

4. A mouthpiece for telephone transmit ters, comprising a trumpet member having a substantially straight tubular body portion with a plurality of outlets opening directly into the atmosphere. and means for securing said body portion to a transmitter independ ent of said outlets.

A mouthpiece for telephone transmitters. comprising a trumpet member having a tubular body portion with open ends. and a tubular connection leading laterally from said body portion intermediate of said ends.

(3. A mouthpiece for telephone transmitters. comprising a trumpet member ha ring a tubular body portion with free open ends. one of which is flared, and tubular connecting means projecting laterally from said body portion intermediate of its ends.

7. in a mouthpiece for telephone trans initters. the combination of a trumpet member having a tapering tubular body portion with open ends, tubular connecting means projecting laterally from said body portion. and a removable lining tube fitted in said tubular body portion.

8. In a mouthpiece for telephone transmitters, the combination of a trumpet member having a tapering tubular body portion with open ends, tubular connecting means projecting laterally from said body portion, and a removable lining tube fitted in said tubular body portion, the wall of said linin tube extending across the junction of said body portion and tubular connection.

9. In a mouthpiece for telephone transmitters, the combination of a trumpet member having a tapering tubular body portion with open ends, tubular connecting means projecting laterally from said body portion,

ltltl and a removable lining tube fitted in said tubular body portion, one end of said lining tube projecting from said body portion.

10. The combination with a telephone transniitter and a tubular seat at the face of said transmitter, of a mouthpiece comprising a trumpet member havinga tubular body portion with open ends, and tubular connecting means projecting laterally from said body portion and adapted to rotatably engage said seat at the face of the transmitter.

11. The combination with a telephone transmitter and a tubular seat at the face of said transmitter, of a trumpet member having a tubular body portion with open ends and a tubular stem projecting laterally from said body portion, and an elbow member adapted at one end to rotatably engage said seat at the face of the transmitter and at its other end to rotatably receive said stem of the trumpet member.

12. The combination with a telephone transmitter and a tubular seat at the face of said transmitter, of a tubular elbow-shaped member adapted at one end to telescopically and rotatably fit said seat, and a trumpet member having a tubular body portion with open ends, and a tubular stem projecting laterally from said body portion and adapted to telescopically and rotatably fit both the other end of said elbow-shaped member and also the said seat at the face of the transmit ter.

13. The combination with a telephone transmitter and a tubular seat at the face of said transmitter, of a tubular elbow-shaped member adapted at one end to rotatably fit said seat, a trumpet member having a tubula r body portion with open ends and a tubular stem projecting laterally from said body portion adapted to rotatably fit both the other end of said elbowshaped member and also the said seat at the face of the transmitter, and a strainer removably fittin both sa id first mentioned end of the elbow-s taped lrnember and said stem of the trumpet mem- 14. The combination with a telephone transmitter, and a tubular seat at the face of said transmitter, of a tubular clbow shaped member rotatably fitting at one end the said seat, a removable cap at the outer side of the l l l l l bend of said elbow-shaped member, and a trumpet member having a tubular body por tion with open ends and a tubular stem pro jecting laterally from said body ortion and rotatably fitting the other end 0: said elbow member.

15. The combination with a telephone transmitter having an interiorly threaded aperture at its face, of a bushing screwed into said aperture and having a radially enlarged outer end providing an interior shoulder, a mouthpiece comprising a trumpet member having a tubular body portion with open ends and a tubular connection project ing laterally from said body portion and adapted to enter said bushing, and a strainer removably inserted in said connection and engaging said shoulder of the bushing.

16. The combination with a telephone transmitter having an interiorly threaded aperture at its face, of a bushing screwed into said aperture and having perforations in its Walls, a mouthpiece comprising a trumpet member having a tubular body pon tion with open ends and a tubular connection projecting laterally from said body portion and having an exteriorly and circumferentially grooved end adapted to enter said bushing, and a resilient clip having friction pieces adapted to project through said openings of the bushing into engagement with the said connection at its said grom'c.

17. A mouthpiece for telephone transmit ters, comprising a trumpet member having a substantially straight tubular sound passage with a plurality of outlets opening directly into the atmos )here, and a hollow connecting member adapted to secure said trumpet member to a transmitter independent of said outlets.

18. The combination with a telephone transmitter, of a connecting member attached to the transmitter face, and a mouthpiece comprising a trumpet member having a tubular body portion with open ends and a tu bnlar connection projecting laterally from said body portion independent of said open ends and engaging said connectin member.

JOHN A. JAMtasoN. lVitnesses RUSSELL M. Evnnn'r'r, FRANCES E. Bnonon'rr. 

